/* * linux/drivers/video/vfb.c -- Virtual frame buffer device * * Copyright (C) 2002 James Simmons * * Copyright (C) 1997 Geert Uytterhoeven * * This file is subject to the terms and conditions of the GNU General Public * License. See the file COPYING in the main directory of this archive for * more details. */ #include <linux/module.h>#include <linux/kernel.h>#include <linux/errno.h>#include <linux/string.h>#include <linux/mm.h>#include <linux/vmalloc.h>#include <linux/delay.h>#include <linux/interrupt.h>#include <linux/platform_device.h> #include <linux/fb.h>#include <linux/init.h> /* * RAM we reserve for the frame buffer. This defines the maximum screen * size * * The default can be overridden if the driver is compiled as a module */ #define VIDEOMEMSIZE (1*1024*1024) /* 1 MB */ static void *videomemory;static u_long videomemorysize = VIDEOMEMSIZE;module_param(videomemorysize, ulong, 0); /********************************************************************** * * Memory management * **********************************************************************/static void *rvmalloc(unsigned long size){ void *mem; unsigned long adr; size = PAGE_ALIGN(size); mem = vmalloc_32(size); if (!mem) return NULL; memset(mem, 0, size); /* Clear the ram out, no junk to the user */ adr = (unsigned long) mem; while (size > 0) { SetPageReserved(vmalloc_to_page((void *)adr)); adr += PAGE_SIZE; size -= PAGE_SIZE; } return mem;} static void rvfree(void *mem, unsigned long size){ unsigned long adr; if (!mem) return; adr = (unsigned long) mem; while ((long) size > 0) { ClearPageReserved(vmalloc_to_page((void *)adr)); adr += PAGE_SIZE; size -= PAGE_SIZE; } vfree(mem);} static struct fb_var_screeninfo vfb_default = { .xres = 640, .yres = 480, .xres_virtual = 640, .yres_virtual = 480, .bits_per_pixel = 8, .red = { 0, 8, 0 }, .green = { 0, 8, 0 }, .blue = { 0, 8, 0 }, .activate = FB_ACTIVATE_TEST, .height = -1, .width = -1, .pixclock = 20000, .left_margin = 64, .right_margin = 64, .upper_margin = 32, .lower_margin = 32, .hsync_len = 64, .vsync_len = 2, .vmode = FB_VMODE_NONINTERLACED,}; static struct fb_fix_screeninfo vfb_fix = { .id = "Virtual FB", .type = FB_TYPE_PACKED_PIXELS, .visual = FB_VISUAL_PSEUDOCOLOR, .xpanstep = 1, .ypanstep = 1, .ywrapstep = 1, .accel = FB_ACCEL_NONE,}; static bool vfb_enable __initdata = 0; /* disabled by default */module_param(vfb_enable, bool, 0); static int vfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info);static int vfb_set_par(struct fb_info *info);static int vfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, u_int transp, struct fb_info *info);static int vfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info);static int vfb_mmap(struct fb_info *info, struct vm_area_struct *vma); static struct fb_ops vfb_ops = { .fb_read = fb_sys_read, .fb_write = fb_sys_write, .fb_check_var = vfb_check_var, .fb_set_par = vfb_set_par, .fb_setcolreg = vfb_setcolreg, .fb_pan_display = vfb_pan_display, .fb_fillrect = sys_fillrect, .fb_copyarea = sys_copyarea, .fb_imageblit = sys_imageblit, .fb_mmap = vfb_mmap,}; /* * Internal routines */ static u_long get_line_length(int xres_virtual, int bpp){ u_long length; length = xres_virtual * bpp; length = (length + 31) & ~31; length >>= 3; return (length);} /* * Setting the video mode has been split into two parts. * First part, xxxfb_check_var, must not write anything * to hardware, it should only verify and adjust var. * This means it doesn't alter par but it does use hardware * data from it to check this var. */ static int vfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info){ u_long line_length; /* * FB_VMODE_CONUPDATE and FB_VMODE_SMOOTH_XPAN are equal! * as FB_VMODE_SMOOTH_XPAN is only used internally */ if (var->vmode & FB_VMODE_CONUPDATE) { var->vmode |= FB_VMODE_YWRAP; var->xoffset = info->var.xoffset; var->yoffset = info->var.yoffset; } /* * Some very basic checks */ if (!var->xres) var->xres = 1; if (!var->yres) var->yres = 1; if (var->xres > var->xres_virtual) var->xres_virtual = var->xres; if (var->yres > var->yres_virtual) var->yres_virtual = var->yres; if (var->bits_per_pixel <= 1) var->bits_per_pixel = 1; else if (var->bits_per_pixel <= 8) var->bits_per_pixel = 8; else if (var->bits_per_pixel <= 16) var->bits_per_pixel = 16; else if (var->bits_per_pixel <= 24) var->bits_per_pixel = 24; else if (var->bits_per_pixel <= 32) var->bits_per_pixel = 32; else return -EINVAL; if (var->xres_virtual < var->xoffset + var->xres) var->xres_virtual = var->xoffset + var->xres; if (var->yres_virtual < var->yoffset + var->yres) var->yres_virtual = var->yoffset + var->yres; /* * Memory limit */ line_length = get_line_length(var->xres_virtual, var->bits_per_pixel); if (line_length * var->yres_virtual > videomemorysize) return -ENOMEM; /* * Now that we checked it we alter var. The reason being is that the video * mode passed in might not work but slight changes to it might make it * work. This way we let the user know what is acceptable. */ switch (var->bits_per_pixel) { case 1: case 8: var->red.offset = 0; var->red.length = 8; var->green.offset = 0; var->green.length = 8; var->blue.offset = 0; var->blue.length = 8; var->transp.offset = 0; var->transp.length = 0; break; case 16: /* RGBA 5551 */ if (var->transp.length) { var->red.offset = 0; var->red.length = 5; var->green.offset = 5; var->green.length = 5; var->blue.offset = 10; var->blue.length = 5; var->transp.offset = 15; var->transp.length = 1; } else { /* RGB 565 */ var->red.offset = 0; var->red.length = 5; var->green.offset = 5; var->green.length = 6; var->blue.offset = 11; var->blue.length = 5; var->transp.offset = 0; var->transp.length = 0; } break; case 24: /* RGB 888 */ var->red.offset = 0; var->red.length = 8; var->green.offset = 8; var->green.length = 8; var->blue.offset = 16; var->blue.length = 8; var->transp.offset = 0; var->transp.length = 0; break; case 32: /* RGBA 8888 */ var->red.offset = 0; var->red.length = 8; var->green.offset = 8; var->green.length = 8; var->blue.offset = 16; var->blue.length = 8; var->transp.offset = 24; var->transp.length = 8; break; } var->red.msb_right = 0; var->green.msb_right = 0; var->blue.msb_right = 0; var->transp.msb_right = 0; return 0;} /* This routine actually sets the video mode. It's in here where we * the hardware state info->par and fix which can be affected by the * change in par. For this driver it doesn't do much. */static int vfb_set_par(struct fb_info *info){ info->fix.line_length = get_line_length(info->var.xres_virtual, info->var.bits_per_pixel); return 0;} /* * Set a single color register. The values supplied are already * rounded down to the hardware's capabilities (according to the * entries in the var structure). Return != 0 for invalid regno. */ static int vfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, u_int transp, struct fb_info *info){ if (regno >= 256) /* no. of hw registers */ return 1; /* * Program hardware... do anything you want with transp */ /* grayscale works only partially under directcolor */ if (info->var.grayscale) { /* grayscale = 0.30*R + 0.59*G + 0.11*B */ red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8; } /* Directcolor: * var->{color}.offset contains start of bitfield * var->{color}.length contains length of bitfield * {hardwarespecific} contains width of RAMDAC * cmap[X] is programmed to (X << red.offset) | (X << green.offset) | (X << blue.offset) * RAMDAC[X] is programmed to (red, green, blue) * * Pseudocolor: * var->{color}.offset is 0 unless the palette index takes less than * bits_per_pixel bits and is stored in the upper * bits of the pixel value * var->{color}.length is set so that 1 << length is the number of available * palette entries * cmap is not used * RAMDAC[X] is programmed to (red, green, blue) * * Truecolor: * does not use DAC. Usually 3 are present. * var->{color}.offset contains start of bitfield * var->{color}.length contains length of bitfield * cmap is programmed to (red << red.offset) | (green << green.offset) | * (blue << blue.offset) | (transp << transp.offset) * RAMDAC does not exist */#define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16) switch (info->fix.visual) { case FB_VISUAL_TRUECOLOR: case FB_VISUAL_PSEUDOCOLOR: red = CNVT_TOHW(red, info->var.red.length); green = CNVT_TOHW(green, info->var.green.length); blue = CNVT_TOHW(blue, info->var.blue.length); transp = CNVT_TOHW(transp, info->var.transp.length); break; case FB_VISUAL_DIRECTCOLOR: red = CNVT_TOHW(red, 8); /* expect 8 bit DAC */ green = CNVT_TOHW(green, 8); blue = CNVT_TOHW(blue, 8); /* hey, there is bug in transp handling... */ transp = CNVT_TOHW(transp, 8); break; }#undef CNVT_TOHW /* Truecolor has hardware independent palette */ if (info->fix.visual == FB_VISUAL_TRUECOLOR) { u32 v; if (regno >= 16) return 1; v = (red << info->var.red.offset) | (green << info->var.green.offset) | (blue << info->var.blue.offset) | (transp << info->var.transp.offset); switch (info->var.bits_per_pixel) { case 8: break; case 16: ((u32 *) (info->pseudo_palette))[regno] = v; break; case 24: case 32: ((u32 *) (info->pseudo_palette))[regno] = v; break; } return 0; } return 0;} /* * Pan or Wrap the Display * * This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag */ static int vfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info){ if (var->vmode & FB_VMODE_YWRAP) { if (var->yoffset >= info->var.yres_virtual || var->xoffset) return -EINVAL; } else { if (var->xoffset + info->var.xres > info->var.xres_virtual || var->yoffset + info->var.yres > info->var.yres_virtual) return -EINVAL; } info->var.xoffset = var->xoffset; info->var.yoffset = var->yoffset; if (var->vmode & FB_VMODE_YWRAP) info->var.vmode |= FB_VMODE_YWRAP; else info->var.vmode &= ~FB_VMODE_YWRAP; return 0;} /* * Most drivers don't need their own mmap function */ static int vfb_mmap(struct fb_info *info, struct vm_area_struct *vma){ unsigned long start = vma->vm_start; unsigned long size = vma->vm_end - vma->vm_start; unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; unsigned long page, pos; if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT)) return -EINVAL; if (size > info->fix.smem_len) return -EINVAL; if (offset > info->fix.smem_len - size) return -EINVAL; pos = (unsigned long)info->fix.smem_start + offset; while (size > 0) { page = vmalloc_to_pfn((void *)pos); if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED)) { return -EAGAIN; } start += PAGE_SIZE; pos += PAGE_SIZE; if (size > PAGE_SIZE) size -= PAGE_SIZE; else size = 0; } return 0; } #ifndef MODULE/* * The virtual framebuffer driver is only enabled if explicitly * requested by passing 'video=vfb:' (or any actual options). */static int __init vfb_setup(char *options){ char *this_opt; vfb_enable = 0; if (!options) return 1; vfb_enable = 1; if (!*options) return 1; while ((this_opt = strsep(&options, ",")) != NULL) { if (!*this_opt) continue; /* Test disable for backwards compatibility */ if (!strcmp(this_opt, "disable")) vfb_enable = 0; } return 1;}#endif /* MODULE */ /* * Initialisation */ static int vfb_probe(struct platform_device *dev){ struct fb_info *info; int retval = -ENOMEM; /* * For real video cards we use ioremap. */ if (!(videomemory = rvmalloc(videomemorysize))) return retval; /* * VFB must clear memory to prevent kernel info * leakage into userspace * VGA-based drivers MUST NOT clear memory if * they want to be able to take over vgacon */ memset(videomemory, 0, videomemorysize); Lines 1–500 of 610. Load more
/* * linux/drivers/video/vfb.c -- Virtual frame buffer device * * Copyright (C) 2002 James Simmons * * Copyright (C) 1997 Geert Uytterhoeven * * This file is subject to the terms and conditions of the GNU General Public * License. See the file COPYING in the main directory of this archive for * more details. */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/errno.h> #include <linux/string.h> #include <linux/mm.h> #include <linux/vmalloc.h> #include <linux/delay.h> #include <linux/interrupt.h> #include <linux/platform_device.h> #include <linux/fb.h> #include <linux/init.h> /* * RAM we reserve for the frame buffer. This defines the maximum screen * size * * The default can be overridden if the driver is compiled as a module */ #define VIDEOMEMSIZE (1*1024*1024) /* 1 MB */ static void *videomemory; static u_long videomemorysize = VIDEOMEMSIZE; module_param(videomemorysize, ulong, 0); /********************************************************************** * * Memory management * **********************************************************************/ static void *rvmalloc(unsigned long size) { void *mem; unsigned long adr; size = PAGE_ALIGN(size); mem = vmalloc_32(size); if (!mem) return NULL; memset(mem, 0, size); /* Clear the ram out, no junk to the user */ adr = (unsigned long) mem; while (size > 0) { SetPageReserved(vmalloc_to_page((void *)adr)); adr += PAGE_SIZE; size -= PAGE_SIZE; } return mem; } static void rvfree(void *mem, unsigned long size) { unsigned long adr; if (!mem) return; adr = (unsigned long) mem; while ((long) size > 0) { ClearPageReserved(vmalloc_to_page((void *)adr)); adr += PAGE_SIZE; size -= PAGE_SIZE; } vfree(mem); } static struct fb_var_screeninfo vfb_default = { .xres = 640, .yres = 480, .xres_virtual = 640, .yres_virtual = 480, .bits_per_pixel = 8, .red = { 0, 8, 0 }, .green = { 0, 8, 0 }, .blue = { 0, 8, 0 }, .activate = FB_ACTIVATE_TEST, .height = -1, .width = -1, .pixclock = 20000, .left_margin = 64, .right_margin = 64, .upper_margin = 32, .lower_margin = 32, .hsync_len = 64, .vsync_len = 2, .vmode = FB_VMODE_NONINTERLACED, }; static struct fb_fix_screeninfo vfb_fix = { .id = "Virtual FB", .type = FB_TYPE_PACKED_PIXELS, .visual = FB_VISUAL_PSEUDOCOLOR, .xpanstep = 1, .ypanstep = 1, .ywrapstep = 1, .accel = FB_ACCEL_NONE, }; static bool vfb_enable __initdata = 0; /* disabled by default */ module_param(vfb_enable, bool, 0); static int vfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info); static int vfb_set_par(struct fb_info *info); static int vfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, u_int transp, struct fb_info *info); static int vfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info); static int vfb_mmap(struct fb_info *info, struct vm_area_struct *vma); static struct fb_ops vfb_ops = { .fb_read = fb_sys_read, .fb_write = fb_sys_write, .fb_check_var = vfb_check_var, .fb_set_par = vfb_set_par, .fb_setcolreg = vfb_setcolreg, .fb_pan_display = vfb_pan_display, .fb_fillrect = sys_fillrect, .fb_copyarea = sys_copyarea, .fb_imageblit = sys_imageblit, .fb_mmap = vfb_mmap, }; /* * Internal routines */ static u_long get_line_length(int xres_virtual, int bpp) { u_long length; length = xres_virtual * bpp; length = (length + 31) & ~31; length >>= 3; return (length); } /* * Setting the video mode has been split into two parts. * First part, xxxfb_check_var, must not write anything * to hardware, it should only verify and adjust var. * This means it doesn't alter par but it does use hardware * data from it to check this var. */ static int vfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) { u_long line_length; /* * FB_VMODE_CONUPDATE and FB_VMODE_SMOOTH_XPAN are equal! * as FB_VMODE_SMOOTH_XPAN is only used internally */ if (var->vmode & FB_VMODE_CONUPDATE) { var->vmode |= FB_VMODE_YWRAP; var->xoffset = info->var.xoffset; var->yoffset = info->var.yoffset; } /* * Some very basic checks */ if (!var->xres) var->xres = 1; if (!var->yres) var->yres = 1; if (var->xres > var->xres_virtual) var->xres_virtual = var->xres; if (var->yres > var->yres_virtual) var->yres_virtual = var->yres; if (var->bits_per_pixel <= 1) var->bits_per_pixel = 1; else if (var->bits_per_pixel <= 8) var->bits_per_pixel = 8; else if (var->bits_per_pixel <= 16) var->bits_per_pixel = 16; else if (var->bits_per_pixel <= 24) var->bits_per_pixel = 24; else if (var->bits_per_pixel <= 32) var->bits_per_pixel = 32; else return -EINVAL; if (var->xres_virtual < var->xoffset + var->xres) var->xres_virtual = var->xoffset + var->xres; if (var->yres_virtual < var->yoffset + var->yres) var->yres_virtual = var->yoffset + var->yres; /* * Memory limit */ line_length = get_line_length(var->xres_virtual, var->bits_per_pixel); if (line_length * var->yres_virtual > videomemorysize) return -ENOMEM; /* * Now that we checked it we alter var. The reason being is that the video * mode passed in might not work but slight changes to it might make it * work. This way we let the user know what is acceptable. */ switch (var->bits_per_pixel) { case 1: case 8: var->red.offset = 0; var->red.length = 8; var->green.offset = 0; var->green.length = 8; var->blue.offset = 0; var->blue.length = 8; var->transp.offset = 0; var->transp.length = 0; break; case 16: /* RGBA 5551 */ if (var->transp.length) { var->red.offset = 0; var->red.length = 5; var->green.offset = 5; var->green.length = 5; var->blue.offset = 10; var->blue.length = 5; var->transp.offset = 15; var->transp.length = 1; } else { /* RGB 565 */ var->red.offset = 0; var->red.length = 5; var->green.offset = 5; var->green.length = 6; var->blue.offset = 11; var->blue.length = 5; var->transp.offset = 0; var->transp.length = 0; } break; case 24: /* RGB 888 */ var->red.offset = 0; var->red.length = 8; var->green.offset = 8; var->green.length = 8; var->blue.offset = 16; var->blue.length = 8; var->transp.offset = 0; var->transp.length = 0; break; case 32: /* RGBA 8888 */ var->red.offset = 0; var->red.length = 8; var->green.offset = 8; var->green.length = 8; var->blue.offset = 16; var->blue.length = 8; var->transp.offset = 24; var->transp.length = 8; break; } var->red.msb_right = 0; var->green.msb_right = 0; var->blue.msb_right = 0; var->transp.msb_right = 0; return 0; } /* This routine actually sets the video mode. It's in here where we * the hardware state info->par and fix which can be affected by the * change in par. For this driver it doesn't do much. */ static int vfb_set_par(struct fb_info *info) { info->fix.line_length = get_line_length(info->var.xres_virtual, info->var.bits_per_pixel); return 0; } /* * Set a single color register. The values supplied are already * rounded down to the hardware's capabilities (according to the * entries in the var structure). Return != 0 for invalid regno. */ static int vfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, u_int transp, struct fb_info *info) { if (regno >= 256) /* no. of hw registers */ return 1; /* * Program hardware... do anything you want with transp */ /* grayscale works only partially under directcolor */ if (info->var.grayscale) { /* grayscale = 0.30*R + 0.59*G + 0.11*B */ red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8; } /* Directcolor: * var->{color}.offset contains start of bitfield * var->{color}.length contains length of bitfield * {hardwarespecific} contains width of RAMDAC * cmap[X] is programmed to (X << red.offset) | (X << green.offset) | (X << blue.offset) * RAMDAC[X] is programmed to (red, green, blue) * * Pseudocolor: * var->{color}.offset is 0 unless the palette index takes less than * bits_per_pixel bits and is stored in the upper * bits of the pixel value * var->{color}.length is set so that 1 << length is the number of available * palette entries * cmap is not used * RAMDAC[X] is programmed to (red, green, blue) * * Truecolor: * does not use DAC. Usually 3 are present. * var->{color}.offset contains start of bitfield * var->{color}.length contains length of bitfield * cmap is programmed to (red << red.offset) | (green << green.offset) | * (blue << blue.offset) | (transp << transp.offset) * RAMDAC does not exist */ #define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16) switch (info->fix.visual) { case FB_VISUAL_TRUECOLOR: case FB_VISUAL_PSEUDOCOLOR: red = CNVT_TOHW(red, info->var.red.length); green = CNVT_TOHW(green, info->var.green.length); blue = CNVT_TOHW(blue, info->var.blue.length); transp = CNVT_TOHW(transp, info->var.transp.length); break; case FB_VISUAL_DIRECTCOLOR: red = CNVT_TOHW(red, 8); /* expect 8 bit DAC */ green = CNVT_TOHW(green, 8); blue = CNVT_TOHW(blue, 8); /* hey, there is bug in transp handling... */ transp = CNVT_TOHW(transp, 8); break; } #undef CNVT_TOHW /* Truecolor has hardware independent palette */ if (info->fix.visual == FB_VISUAL_TRUECOLOR) { u32 v; if (regno >= 16) return 1; v = (red << info->var.red.offset) | (green << info->var.green.offset) | (blue << info->var.blue.offset) | (transp << info->var.transp.offset); switch (info->var.bits_per_pixel) { case 8: break; case 16: ((u32 *) (info->pseudo_palette))[regno] = v; break; case 24: case 32: ((u32 *) (info->pseudo_palette))[regno] = v; break; } return 0; } return 0; } /* * Pan or Wrap the Display * * This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag */ static int vfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info) { if (var->vmode & FB_VMODE_YWRAP) { if (var->yoffset >= info->var.yres_virtual || var->xoffset) return -EINVAL; } else { if (var->xoffset + info->var.xres > info->var.xres_virtual || var->yoffset + info->var.yres > info->var.yres_virtual) return -EINVAL; } info->var.xoffset = var->xoffset; info->var.yoffset = var->yoffset; if (var->vmode & FB_VMODE_YWRAP) info->var.vmode |= FB_VMODE_YWRAP; else info->var.vmode &= ~FB_VMODE_YWRAP; return 0; } /* * Most drivers don't need their own mmap function */ static int vfb_mmap(struct fb_info *info, struct vm_area_struct *vma) { unsigned long start = vma->vm_start; unsigned long size = vma->vm_end - vma->vm_start; unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; unsigned long page, pos; if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT)) return -EINVAL; if (size > info->fix.smem_len) return -EINVAL; if (offset > info->fix.smem_len - size) return -EINVAL; pos = (unsigned long)info->fix.smem_start + offset; while (size > 0) { page = vmalloc_to_pfn((void *)pos); if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED)) { return -EAGAIN; } start += PAGE_SIZE; pos += PAGE_SIZE; if (size > PAGE_SIZE) size -= PAGE_SIZE; else size = 0; } return 0; } #ifndef MODULE /* * The virtual framebuffer driver is only enabled if explicitly * requested by passing 'video=vfb:' (or any actual options). */ static int __init vfb_setup(char *options) { char *this_opt; vfb_enable = 0; if (!options) return 1; vfb_enable = 1; if (!*options) return 1; while ((this_opt = strsep(&options, ",")) != NULL) { if (!*this_opt) continue; /* Test disable for backwards compatibility */ if (!strcmp(this_opt, "disable")) vfb_enable = 0; } return 1; } #endif /* MODULE */ /* * Initialisation */ static int vfb_probe(struct platform_device *dev) { struct fb_info *info; int retval = -ENOMEM; /* * For real video cards we use ioremap. */ if (!(videomemory = rvmalloc(videomemorysize))) return retval; /* * VFB must clear memory to prevent kernel info * leakage into userspace * VGA-based drivers MUST NOT clear memory if * they want to be able to take over vgacon */ memset(videomemory, 0, videomemorysize);